1 {scene: Mars}1 Martian 1: Look at this. The Earthlings are messing around with time travel.2 Martian 1: Going back in time and influencing events that have already happened.3 Martian 1: They're ruining the time-space continuum of the entire universe! Using up our most precious resource!4 Martian 1: Do they think history just happens all by itself?!

I started writing this comic with the line "Do they think history grows on trees?" in my head. It sounded funny to me at the time.
Then I realised it would probably make more sense if it was reworded slightly.